Frequency-dependent stability of parallel-plate electrostatic actuators in conductive fluids

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Date

2010-05

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Publisher

AIP Publishing

Abstract

We present an electromechanical stability analysis of passivated parallel-plate electrostatic actuators in conductive dielectric media and show that the pull-in instability can be eliminated by tuning the applied frequency below a design-dependent stability limit. A partial instability region is also obtained, where the actuator jumps from the pull-in displacement to another stable position within the gap. The results predict that the stability limit is always greater than the critical actuation frequency, and therefore any device that is feasible to actuate in a conductive fluid can be operated with stability over the full range of motion. (C) 2010 American Institute of Physics. [doi:10.1063/1.3389491]

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Keywords

dielectric materials, electrostatic actuators, mechanical stability, microfluidics, mems, design, Physics

Citation

Sounart, T. L.; Panchawagh, H. V.; Mahajan, R. L., "Frequency-dependent stability of parallel-plate electrostatic actuators in conductive fluids," Appl. Phys. Lett. 96, 203505 (2010); http://dx.doi.org/10.1063/1.3389491